P87C52SBAA IS NOT GETTING DOWLOADED FROM THE BUFFER OF TOPMAX II PROGRAMMER.
SHOWING ERROR "PROGRAM ERROR, CHIP ADDRESS 0000000h data 00h, checksum 0000000h, data 02h.
At first we loaded from another P87C52 programmed microcontroller which has A12Dh. But the buffer is not getting copied and showing the above error.
Please advice us so that we can copy the data and use the microcontroller properly.
Regards,
Arup Roy

6 Suggested Answers

Hi,
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In order to understand what a checksum error is, it is important to first learn what a checksum is. A checksum is a redundancy check during a computer's start up process, which makes sure that the computer's data is intact and unhampered. The data is scanned and tested for accuracy, either based on how well it relates to data elsewhere or based on previous data that was stored on the same computer. Essentially, all of the bits of data in a particular document or file are added up and a number or hash is created. This number or hash can then be compared to the number or hash generated from the same file on another person's computer or at a previous time on the same computer.
When does a Checksum Error Occur?

Although a checksum error can occur at any time while a computer is comparing data, it is most commonly present during a computer's startup procedure. During a computer's start up processes, the BIOS settings, which are stored in a CMOS memory chip, are computed and then checked against the previous value. If the computed values do not match exactly, the computer warns the user with a checksum error message that the data may have been changed or corrupted between start up cycles. All BIOS programs present a different error and therefore will either continue with booting or refuse to boot until the problem is corrected.

Depending on the type and the severity of the error generated, there may be one of a variety of ways to rectify the issue. The most common cause of a checksum error during the startup process is a faulty battery that is not providing sufficient power to the motherboard when the computer is off. However, motherboard malfunctions and viruses can also contribute to checksum errors.
Other Types of Checksum Errors

Another type of checksum error may occur with any program at any time. It is usual for many programs to now provide checksum information when that program is downloaded. Using a checksum program or MD5 hash checker, a user can quickly compare the checksum of a downloaded program with the checksum that the software developer provides. This is a common way to make sure that users are downloading the proper program and that no data was corrupted during the download process. Checksum errors originating from download errors can easily be corrected by re-downloading the problematic program.

This means that your graphics chip is pootched.Since the graphics card is usually fixed to the motherboard the only way to repair is to take it in for service.Since the service may be ½ the cost of a new laptop it may be best to just purchase a new one.

Can't find Error 8403 in the service manual. Please advise the correct error code and I'll see what I can find out for you.

E-7201 TOC READ ERROR 26: TOC data could not be read.
E-6002 DSP PROGRAM
DOWNLOAD ERROR
62: The program cannot be written in the DSP.
E-8301
PLAYER ERROR
(Startup error)
12: The desired address could not be searched.
15: Address data could not be read.
22: The Focus Servo could not be closed.
91: The pickup could not be returned to the inner track.
E-8302 PLAYER ERROR
(Abnormality in playback)
12: The desired address could not be searched.
15: Address data could not be read.
22: The Focus Servo could not be closed.
E-8303
PLAYER ERROR
(Abnormality in writing to the buffer)
99: Abnormality in writing in the buffer
E-8304
MP3 DECODE ERROR
(Abnormality in decoding)
Abnormality in decoding ∗∗
E-8305
DATA FORMAT ERROR
(Inappropriate data format)
A data format other than MP3 was used. ∗∗
E-9101 MECHANICAL TIME OUT 90: Abnormality in the disc-loading mechanism (TIMEOUT)

you didn't state how many hours are on the unit, but I'm guessing close to 3,000 hours, that is when most brands have LCD panel failures, due to the heat over time the coating on the lcd panels burns off, the panels start to burn up, and it gets worse with time, and you notice it more when you put a fresh bright lamp in. if it is low hours then you could have a bad lamp, that casts a bad tint, but it sounds like fried LcD panels, a sure way to tell, is put up a white back-ground screen and see if you see discolored "BLOB" in the center of the screen.
keeping the filters clean, and the projector cool is the best way to prevent this.

The Checksum error usually indicates a data transmission issue. This may be due to a loose connection, bad wiring, electrical interference (cross-talk), a physical problem with the device itself, or a conflict caused by another software program.
* Make sure that the cable attaching the camera to the computer is secure at both ends.
* Close down all of the computer's other applications before attempting to download.
1. Press the CTRL, ALT and DELETE keys simultaneously. This will bring up the Close Program Window.
2. Highlight the program that you want to close and select END TASK. The Close Program window closes only one program at a time, so you will have to repeat these steps for each program that you want to close.
NOTE: The SYSTRAY and EXPLORER programs should be allowed to run. Do not select End Task for these programs. You will also want to leave any necessary programs running, such as those controlling a wireless mouse or keyboard.